<template>
    <div>
      <!-- 面包屑导航区域 -->
      <el-breadcrumb separator-class="el-icon-arrow-right">
        <el-breadcrumb-item :to="{ path: '/welcome' }">首页</el-breadcrumb-item>
        <el-breadcrumb-item>权限管理</el-breadcrumb-item>
        <el-breadcrumb-item>角色列表</el-breadcrumb-item>
      </el-breadcrumb>
      <!-- 卡片视图 -->
      <el-card>
        <el-row>
          <el-col>
            <el-button type="primary">添加角色</el-button>
          </el-col>
        </el-row>
        <!-- 角色列表区域 -->
        <el-table :data="rolelist" border stripe>
          <!-- 展开列 -->
          <el-table-column type="expand">
            <template slot-scope="scope">
              <el-row :class="['bdbottom', i1===0?'bdtop':'', 'vcenter']" v-for="(item1, i1) in scope.row.children" :key="item1.id">
                <!-- 渲染一级权限 -->
                <el-col :span="5">
                  <el-tag closable @close="removeRightById(scope.row, item1.id)">{{ item1.authName }}</el-tag>
                  <i class="el-icon-caret-right"></i>
                </el-col>
                <!-- 渲染二级和三级权限 -->
                <el-col :span="19">
                  <!-- 通过for循环嵌套渲染二级曲线 -->
                  <el-row :class="[i2===0?'':'bdtop', 'vcenter']" v-for="(item2, i2) in item1.children" :key="item2.id">
                    <el-col :span="6">
                      <el-tag type="success" closable @close="removeRightById(scope.row, item2.id)">{{ item2.authName }}</el-tag>
                      <i class="el-icon-caret-right"></i>
                    </el-col>
                    <el-col :span="18">
                      <el-tag type="warning" v-for="(item3) in item2.children" :key="item3.id" closable @close="removeRightById(scope.row, item3.id)">{{ item3.authName }}</el-tag>
                    </el-col>
                  </el-row>
                </el-col>
              </el-row>
            </template>
          </el-table-column>
          <!-- 索引列 -->
          <el-table-column type="index"></el-table-column>
          <el-table-column label="角色名称" prop="roleName"></el-table-column>
          <el-table-column label="角色描述" prop="roleDesc"></el-table-column>
          <el-table-column label="操作" width="300px">
            <template slot-scope="scope">
              <el-button size="mini" type="primary" icon="el-icon-search">编辑</el-button>
              <el-button size="mini" type="danger" icon="el-icon-delete">删除</el-button>
                <el-button size="mini" type="warning" icon="el-icon-setting" @click="showSetRightDialog(scope.row)">分配权限</el-button>
            </template>
          </el-table-column>
        </el-table>
      </el-card>

      <!-- 分配权限的对话框 -->
      <el-dialog
        title="分配权限" :visible.sync="setRightdialogVisible" width="50%" @close="setRightdialogClosed">
        <!-- 树形控件 -->
        <el-tree :data="rightslist" :props="treeProps" show-checkbox node-key="id"
                 default-expand-all ref="treeRef"
                 :default-checked-keys="defKeys"></el-tree>
        <span slot="footer" class="dialog-footer">
    <el-button @click="setRightdialogVisible = false">取 消</el-button>
    <el-button type="primary" @click="allotRights">确 定</el-button>
  </span>
      </el-dialog>
    </div>
</template>

<script>
export default {
  name: 'Roles',
  data() {
    return {
      // 所有角色列表数据
      rolelist: [],
      // 控制权限分配对话框的显示与隐藏
      setRightdialogVisible: false,
      // 所有权限的数据
      rightslist: [],
      // 树形控件的属性绑定对象
      treeProps: {
        label: 'authName',
        children: 'children'
      },
      // 默认选中的节点id数组
      defKeys: [],
      // 即将分配权限的角色id
      roleId: ''
    }
  },
  created () {
    this.getRolesList()
  },
  methods: {
    async getRolesList () {
      const { data: res } = await this.$http.get('roles')
      if (res.meta.status !== 200) {
        return this.$message.error('获取角色列表失败！')
      }
      this.rolelist = res.data
    },
    // 根据id删除对应的权限
    async removeRightById(role, rightid) {
      // 弹框提示用户是否要删除
      const confirmresult = await this.$confirm('此权限将被永久删除', '提示', {
        confirmButtonText: '确定',
        cancelButtonText: '取消',
        type: 'warning'
      }).catch(err => err)
      if (confirmresult !== 'confirm') {
        return this.$message.info('取消了删除')
      }
      const { data: res } = await this.$http.delete(`roles/${role.id}/rights/${rightid}`)
      if (res.meta.status !== 200) {
        return this.$message.err('权限删除失败！')
      }
      // this.getRolesList()
      role.children = res.data
    },
    // 展示分配权限的对话框
    async showSetRightDialog(role) {
      this.roleId = role.id
      // 获取所有权限的数据
      const { data: res } = await this.$http.get('rights/tree')
      if (res.meta.status !== 200) {
        return this.$message.error('获取权限数据失败！')
      }
      // 获取的权限数据保存到data中
      this.rightslist = res.data
      // 递归获取三级节点id
      this.getLeafKeys(role, this.defKeys)
      this.setRightdialogVisible = true
    },
    // 通过递归的形式获取角色下所有三级权限的数据，保存到数组中
    getLeafKeys(node, arr) {
      // 如果当前node节点不包含children属性，则是三级节点
      if (!node.children) {
        return arr.push(node.id)
      }
      node.children.forEach(item => this.getLeafKeys(item, arr))
    },
    // 监听分配权限对话框的关闭事件
    setRightdialogClosed() {
      this.defKeys = []
    },
    // 点击为角色分配权限
    async allotRights() {
      const keys = [
        this.$refs.treeRef.getCheckedKeys(),
        this.$refs.treeRef.getHalfCheckedKeys()
      ]
      const idStr = keys.join(',')
      const { data: res } = await this.$http.post(`roles/${this.roleId}/rights`, { rids: idStr })
      if (res.meta.status !== 200) {
        return this.$message.error('分配权限失败！')
      }
      this.$message.success('分配权限成功！')
      this.getRolesList()
      this.setRightdialogVisible = false
    }
  }
}
</script>

<style scoped>
.el-tag{
  margin: 7px;
}

.bdtop {
  border-top: 1px solid #eee;
}

.bdbottom {
  border-bottom: 1px solid #eee;
}

.vcenter {
  display: flex;
  align-items: center;
}
</style>
